Use of flood chronology for detailed environmental analysis: a case study of Lake Kizaki in the northern Japanese Alps,central Japan |
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| Authors: | Takuma Ito Haruka Iwamoto Koichi Kamiya Takehiko Fukushima Fujio Kumon |
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| Institution: | (1) Interdisciplinary Graduate School of Science and Technology, Shinshu University, Matsumoto 390-8621, Japan;(2) Graduate School of Science and Technology, Shinshu University, Matsumoto 390-8621, Japan;(3) Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan;(4) Department of Environmental Science, Faculty of Science, Shinshu University, Matsumoto 390-8621, Japan |
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| Abstract: | This paper presents a study of the usefulness of flood layers as a time marker in sediments and a report of a case study of
Lake Kizaki in central Japan. A flood layer can be identified as a layer having a higher density, coarser grain size, lower
TN content, and higher C/N ratio than those of the upper and lower horizons. It can also be characterized by a hyperpycnal
sequence composed of a basal coarsening-upward unit and a top fining-upward unit. When flood layers can be correlated with
heavy rains in meteorological records, detailed age markers are well established in the sediment. Five flood layers were identified
in the surface sediment of Lake Kizaki, and they could be attributed to the historical heavy rainfalls that took place on
July 12, 1995; September 28, 1983; August 25, 1974; September 26, 1959; and September 1, 1949 under the constraint of an age
model. A precise age model is essential to clarify the environmental changes such as the pollutant history in detail. |
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